JP2019115119A - Power source device, acoustic apparatus, and emergency apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device capable of improving reliability while reducing the circuit scale. A power supply device 1 includes a boost converter 10 that boosts a storage battery voltage V1, a first output capacitor 11 that is electrically connected in parallel to a pair of output terminals 101, 102 of the boost converter 10, and a first. A current suppression circuit 13 electrically connected in series to one of the output terminals 101 and 102 of the pair of output terminals 101 and 102 with the output capacitor 11 of the above, and a first output capacitor 11 sandwiching the current suppression circuit 13 A second output capacitor 12 that is electrically connected in parallel with the drive circuit 20 and is electrically connected to the drive circuit 20 and a control circuit 141. The control circuit 141 selectively switches the operating state of the current suppression circuit 13 to a cutoff state, a continuity state, and a transition state. [Selection diagram] Fig. 3

Description

  The present invention relates to a power supply device, an acoustic device and an emergency device, and more particularly to a power supply device for driving a load by an emergency power supply, an acoustic device having the power supply device and a speaker, and an emergency device including the acoustic device. .

  As a conventional example, an emergency device described in Patent Document 1 is exemplified. The emergency device described in Patent Document 1 (hereinafter referred to as a conventional example) is a so-called guiding sound-attached guiding light having a function of performing visual and auditory evacuation guidance by blinking of a light source and sound output from a speaker. is there.

  In the prior art, a speaker is driven by a light source for blinking (xenon lamp), a blinking block which is supplied with power from a secondary battery for light source and blinks the light source, and power supplied from a secondary battery for induced sound. And an audio block for outputting a guidance sound. The voice block outputs a guidance sound from the speaker according to an emergency signal input from the outside.

  The voice block amplifies the output (voice signal) of a speech synthesis LSI (Large-Scale Integration) that outputs a guidance sound (for example, a voice message such as "Evacuate mouth is here.") And the speech synthesis LSI. And an amplifier for driving the speaker. The operation power supply of the amplifier is supplied from a secondary battery (emergency power supply) for induction noise.

JP 2007-66738 A

  By the way, in a building or the like in which an emergency device such as the above-mentioned conventional example is installed, a plurality of emergency devices are usually connected by a feed wiring to one emergency power source (secondary battery). Therefore, in each emergency device, the input voltage decreases as the wire length from the emergency power supply increases. Therefore, each emergency device is equipped with a power supply device to boost and stabilize the voltage supplied from the emergency power supply. Such a power supply apparatus includes, for example, a boost converter (boost chopper circuit) in order to boost the voltage input from the emergency power supply.

  Here, the power supply device has a smoothing capacitor composed of a capacitor (for example, an electrolytic capacitor or the like) having a relatively large capacity in order to stabilize the output voltage of the boost converter. When the power supply includes a non-insulated boost converter, an excessive inrush current flows through the smoothing capacitor at the moment the power supply voltage of the emergency power is applied to the input terminal of the power supply, damaging the circuit elements of the power supply. There is a risk of giving Therefore, in a normal power supply device, a circuit (current suppression circuit) for suppressing inrush current is provided at the front stage of the boost converter. Furthermore, in the power supply device provided with the non-isolated boost converter, a current flow path is formed from the input terminal to the output terminal even when the boost converter is stopped (standby state). Therefore, the power supply apparatus has a cut off circuit that cuts off the current path between the input terminal and the output terminal in the rear stage of the smoothing capacitor in order to reduce power consumption in the standby state. It is to be noted that both the current suppression circuit and the cutoff circuit are often configured using semiconductor elements such as transistors.

  However, since the conventional power supply apparatus as described above includes a plurality of types of circuits (a current suppression circuit and a cutoff circuit) each configured using a semiconductor element, an increase in manufacturing cost due to an increase in circuit elements or There is a concern that the reliability may be reduced due to the aged deterioration of circuit elements. Therefore, in the configuration of the conventional power supply device, it is difficult to improve the reliability while reducing the circuit scale.

  An object of the present invention is to provide a power supply device, an acoustic device and an emergency device which can improve the reliability while reducing the circuit scale.

  A power supply device according to one aspect of the present invention includes a boost converter for boosting an input voltage input from an emergency power supply, and a first output capacitor electrically connected in parallel with a pair of output terminals of the boost converter. Prepare. The power supply device includes a current suppression circuit electrically connected in series to one of the pair of output terminals with the first output capacitor interposed therebetween. The power supply device includes a second output capacitor electrically connected in parallel to the first output capacitor across the current suppression circuit and electrically connected to a load, and a control circuit. The control circuit selectively switches the operation state of the current suppression circuit to a cutoff state, a conduction state, and a transition state. The control circuit keeps the operation state of the current suppression circuit in the cut-off state until the trigger signal is input, and when the trigger signal is input, the operation state of the current suppression circuit passes from the cut-off state through the transition state. It switches to the said conduction state. The shutoff state is an operation state in which a circuit from the one output terminal of the boost converter to the second output capacitor is shut off. The conduction state is an operation state in which the electric path is brought into conduction. The transition state is an operation state in which transition is made from the blocking state to the conduction state by applying a predetermined transition time.

  An acoustic device according to one aspect of the present invention includes the power supply device, a speaker, and a drive circuit that drives the speaker with power supplied from the power supply device.

  The emergency device according to an aspect of the present invention includes the acoustic device and a housing that houses the acoustic device. The sound device causes the speaker to output a sound for evacuation guidance when a trigger signal is received from the outside.

  The power supply device, the audio device, and the emergency device of the present invention have the effect of being able to improve the reliability while reducing the circuit scale.

FIG. 1 is a perspective view of an emergency device according to an aspect of the present invention. FIG. 2 is an exploded perspective view of the above-mentioned emergency device. FIG. 3 is a circuit diagram of a power supply device and an acoustic device according to an aspect of the present invention. FIG. 4 is a time chart for explaining the operation of the power supply device and the acoustic device of the above.

  Hereinafter, embodiments of a power supply device, an acoustic device, and an emergency device according to one aspect of the present invention will be described in detail with reference to FIGS. 1 to 4. However, each drawing described in the following embodiment is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. The configuration described in the following embodiment is merely an example of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to design etc. as long as the effects of the present invention can be exhibited.

  The emergency device 3 of the present embodiment is realized as a guide light for displaying an evacuation port of a building. When the emergency device 3 receives the guidance sound instruction signal from the guidance light signal device, the guidance sound from the acoustic device 2 of the present embodiment (voice such as "Evacuation port is here." To enhance the induction effect. Is configured to output a message). In addition, the emergency device 3 is configured to blink the blinking light source in order to enhance the induction effect when receiving the blinking instruction signal from the guidance light signal device. In the following description, unless otherwise noted, the upper, lower, right, left, and front / rear directions of the emergency device 3 are defined in the directions shown by the arrows in FIG.

  The emergency device 3 includes a display unit 4, a blinking light source unit 5, a drive device 6, a second storage battery block 7, a housing 30, and the like, as shown in FIGS.

  The housing 30 is formed in a rectangular parallelepiped shape having a rectangular front wall 31, a rear wall 32 and four side walls 33. However, the housing 30 in the present embodiment is configured of the main body 300 and the plate 301. The main body 300 is formed in a box shape with an open front, and constitutes a rear wall 32 of the housing 30 and four side walls 33. A pair of holes 303 pass through the upper side wall 33 (see FIG. 2).

  The plate 301 has a main portion 3010 formed in a rectangular flat plate shape, and four side portions 3011 rising rearward from four sides of the main portion 3010. The main portion 3010 of the plate 301 constitutes the front wall 31 of the housing 30. The four side portions 3011 of the plate 301 constitute front end portions of the four side walls 33 of the housing 30. The plate 301 is removably attached to the main body 300 by a pair of attachment springs 302. The housing 30 is configured by attaching the plate 301 to the front surface of the main body 300. The housing 30 (the main body 300 and the plate 301) is formed of a non-combustible material such as a steel plate.

  A mounting base 35 is screwed to the inner bottom surface of the housing 30 (the front surface of the rear wall 32). The mounting base 35 is formed of a synthetic resin material in a box shape whose front and lower surfaces are open. The display unit 4 and the drive device 6 are housed in the housing 30 in a state of being attached to the mount 35.

  The display unit 4 includes a display plate 40, a light source block 41, a lighting block 42, and a first storage battery block 43.

  The display plate 40 is formed in a rectangular plate shape by a translucent synthetic resin material such as an acrylic resin or a polycarbonate resin. However, the display plate 40 is formed so as to gradually reduce the thickness in the front-rear direction from the upper end to the lower end. On the front of the display plate 40, a pictogram showing an evacuation port is drawn.

  The light source block 41 includes one or more LEDs (Light Emitting Diodes), a light guiding member for guiding light emitted from the LEDs, and a case 410 for housing the LEDs and the light guiding member. The lower surface of the case 410 is provided with an opening for emitting the light emitted from the light guide member to the outside of the case 410. The light source block 41 is mounted on the top of the mount 35, as shown in FIG. In addition, the display plate 40 is attached to the mounting base 35 so that the upper side surface faces the opening of the case 410 of the light source block 41.

  The first storage battery block 43 is configured by accommodating a plurality of battery cells in a synthetic resin battery case having electrical insulation. The battery cell is a storage battery such as a nickel hydrogen battery. The first storage battery block 43 is accommodated at the right end of the mounting base 35 (see FIG. 2).

  The lighting block 42 includes a regular lighting circuit, a first charging circuit, an emergency lighting circuit, and a first control circuit. The regular lighting circuit lights the LED with power supplied from an external power supply (for example, a commercial power system). The first charging circuit charges the battery cells of the first storage battery block 43 with the power supplied from the external power supply. The emergency lighting circuit lights the LED with the power discharged from the first storage battery block 43 when the power supply of the external power supply is stopped. The first control circuit monitors the power supply status of the external power supply, and operates the regular lighting circuit and the first charging circuit and stops the emergency lighting circuit when power is supplied from the external power supply. The first control circuit stops the normal lighting circuit and the first charging circuit and operates the emergency lighting circuit when the power supply of the external power supply stops (power failure).

  Furthermore, while operating the first charging circuit, the first control circuit causes the first display element to emit light to indicate that charging is in progress. The first control circuit forcibly stops the regular lighting circuit and the first charging circuit and forcibly operates the emergency lighting circuit to light the LEDs of the light source block 41 while the first inspection switch is turned on. Let The first control circuit performs a self-checking operation when the self-checking switch is turned on for a predetermined time (for example, 2 seconds) or more. The first control circuit also performs a self-checking operation when the light receiving element receives a control signal using infrared light as a communication medium. In the self-checking operation, the regular lighting circuit and the first charging circuit are forcibly stopped and the emergency lighting circuit is forcibly operated to turn on the LEDs of the light source block 41 until the specified time (20 minutes or 60 minutes) elapses. It is an operation to light up. Then, the first control circuit stops the emergency lighting circuit after the specified time has elapsed, measures the input voltage of the emergency lighting circuit, that is, the battery voltage of the first storage battery block 43, and based on the measured value of the battery voltage. The quality of the first storage battery block 43 is determined. The first control circuit causes the first display element to emit light continuously when it is determined that the first storage battery block 43 is good, and intermittently emits the first display element when it is determined that the first storage battery block 43 is defective. (Flashing)

  The display unit 4 is accommodated in the housing 30 such that the front surface of the display plate 40 is exposed from a rectangular window 310 provided in the front wall 31 of the housing 30 (main portion 3010 of the plate 301). The display unit 4 causes light to be incident on the upper surface of the display plate 40 from the light source block 41 and causes the entire display plate 40 to emit light, thereby enhancing the brightness of the front surface of the display plate 40 and enhancing the visibility of the pictogram.

  The blinking light source unit 5 includes a blinking light source formed of an LED, a lens 55 for controlling distribution of light emitted from the blinking light source (LED), and a mounting member 56 to which the blinking light source and the lens 55 are attached. . The blinking light source unit 5 is accommodated in the housing 30 by fixing the mounting member 56 to the lower end portion of the inner bottom surface (the front surface of the rear wall 32) of the housing 30 (see FIG. 2). However, the lens 55 protrudes outside the housing 30 through the insertion hole 34 provided at the center of the lower side wall 33 of the housing 30 in the longitudinal direction (left and right direction).

  Further, not only the blinking light source unit 5 but also the first switch block 57 and the second switch block 58 are attached to the mounting member 56.

  The first switch block 57 includes a first inspection switch, a self inspection switch, a first display element, a printed wiring board on which a light receiving element is mounted, a first case for housing the printed wiring board, and a first inspection switch. And a first push button 571 for operation. The first case is formed of a synthetic resin material into a rectangular box shape. The lower surface of the first case is substantially the same as the first operation hole in which the first push button 571 is accommodated, the second operation hole smaller in diameter than the first operation hole, the first display hole, and the first operation hole. A light receiving hole of a diameter is provided.

  The first push button 571 is formed in a cylindrical shape, and is accommodated in the first operation hole in a vertically movable state. A first inspection switch including a push button switch is disposed at a position vertically opposed to the first operation hole in the first case. Therefore, the first push button 571 pressed from the outside of the first case moves into the first case, and the upper end of the first push button 571 is pressed to turn on the first check switch. A self-checking switch comprising a push button switch is disposed at a position vertically opposed to the second operation hole in the first case. That is, the self inspection switch is turned on by being pushed by the tip of a thin tool (for example, a driver or the like) inserted from the outside of the first case through the second operation hole. The first display element is disposed at a position vertically opposed to the first display hole in the first case. That is, the light emitted from the first display element is emitted to the outside of the first case through the first display hole. A light receiving element is disposed at a position vertically opposed to the light receiving hole in the first case. That is, the control signal transmitted from the self-checking remote controller is received (received) by the light receiving element through the light receiving hole. The first inspection switch, the self inspection switch, the first display element and the light receiving element are electrically connected to the lighting block 42 by a plurality of electric wires, respectively.

  The second switch block 58 includes a printed wiring board on which the second inspection switch and the second display element are mounted, a second case 580 for housing the printed wiring board, and a second push button 581 for operating the second inspection switch. And The second case 580 is formed of a synthetic resin material into a rectangular box shape.

  The lower surface of the second case 580 is provided with a third operation hole in which the second push button 581 is accommodated, and a second display hole whose diameter is smaller than that of the third operation hole. The second push button 581 is formed in a cylindrical shape, and is accommodated in the third operation hole so as to be vertically movable. A second inspection switch formed of a push button switch is disposed at a position vertically opposed to the third operation hole in the second case 580. Therefore, the second push button 581 pushed from the outside of the second case 580 moves into the second case 580, and the second check switch is pressed by the upper end of the second push button 581 to be turned on. In the second case 580, the second display element is disposed at a position vertically opposed to the second display hole. That is, the light emitted from the second display element is emitted out of the second case 580 through the second display hole.

  The first operation hole, the second operation hole, the first display hole and the light receiving hole of the first case of the first switch block 57, and the second case 580 of the second switch block 58 are provided in the lower side wall 33 of the housing 30. A plurality of holes 331 to 336 corresponding to the third operation hole and the second display hole respectively are provided. The hole 331 is opposed to the first operation hole. Therefore, the tip end portion of the first push button 571 protrudes out of the housing 30 through the hole 331. The hole 332 is opposed to the second operation hole. The hole 333 faces the first display hole. The hole 334 faces the light receiving hole. The hole 335 is opposed to the third operation hole. Therefore, the tip portion of the second push button 581 protrudes out of the housing 30 through the hole 335. The hole 336 faces the second display hole.

  The second storage battery block 7 is configured by wrapping a plurality of dry cell battery cells in a heat-shrinkable tube. Each battery cell is a storage battery such as a nickel hydrogen battery. The second storage battery block 7 is accommodated on the left side of the mount 35 in the housing 30 (see FIG. 2). Further, above the second storage battery block 7 in the housing 30, the speaker 21 constituting the acoustic device 2 is accommodated. A window 311 for the speaker 21 is opened on the left side of the window 310 in the front wall 31 (main portion 3010 of the plate 301) of the housing 30. The window 311 is closed by a cover 312. However, the cover 312 has a large number of holes penetrating in the thickness direction of the cover 312. That is, the sound output from the speaker 21 is emitted to the outside of the housing 30 through a large number of holes passing through the cover 312.

  The driving device 6 includes a blinking light source drive circuit that drives the blinking light source of the blinking light source unit 5, the power supply device 1 included in the acoustic device 2, a driving circuit 20, and an acoustic output circuit 142. The driving device 6 further controls a blinking light source driving circuit and a second charging circuit for charging a second storage battery block 7 for supplying power to the acoustic device 2, and a second charging circuit for controlling the blinking light source driving circuit and the second charging circuit. And a control circuit. The second control circuit controls the blink light source drive circuit when it receives a blink indication signal from the induction light signal device via the signal line, and drives the blink light source with the power supplied from the second storage battery block 7 to blink Turn on the light source. However, the second control circuit controls the drive circuit to intermittently drive the blinking light source in order to enhance the induction effect. For example, the second control circuit preferably controls the drive circuit to drive the light source to emit light for a period of about 50 ms every about 500 ms. The second charging circuit charges the second storage battery block 7 with the power supplied from the external power supply. Furthermore, the second control circuit causes the second display element to emit light when the second charging circuit is operated to indicate that charging is in progress. The second control circuit forcibly stops the second charging circuit while controlling the second charging circuit while the second inspection switch is on, and controls the driving circuit to blink with the power supplied from the second storage battery block 7. Flashing Make the light source emit light.

  The emergency device 3 is attached to a construction material such as a wall or a ceiling T1. For example, each of the two suspension bolts T10 whose upper end portion is embedded in the ceiling T1 is inserted into each of a pair of holes 303 provided in the upper side wall 33 of the housing 30 of the emergency device 3, A nut (not shown) is tightened to each of the suspension bolts T10. Thus, the emergency device 3 is installed on the ceiling T1 by fixing the housing 30 to the pair of suspension bolts T10.

  Subsequently, the acoustic device 2 and the power supply device 1 of the present embodiment will be described in detail with reference to FIGS. 3 and 4.

  As shown in FIG. 3, the acoustic device 2 supplies a speaker 21, a drive circuit (speaker amplifier) 20 for driving the speaker 21, and power for driving the speaker 21 to the drive circuit 20 in this embodiment. And a power supply 1. Preferably, the acoustic device 2 further includes an acoustic output circuit 142.

  The sound output circuit 142 is formed of, for example, a speech synthesis LSI. The sound output circuit 142 outputs a sound signal S3 for causing the speaker 21 to output the synthesized guidance sound to the drive circuit 20. The drive circuit 20 amplifies the acoustic signal S3 input from the acoustic output circuit 142 by the power supplied from the power supply device 1, and outputs the amplified acoustic signal S3 to the speaker 21 to output a guidance sound from the speaker 21. It is configured to let you

  As shown in FIG. 3, the power supply device 1 includes a boost converter 10, a first output capacitor 11, a second output capacitor 12, a current suppression circuit 13, a converter control circuit 140, and a control circuit 141. Have.

  The boost converter 10 is configured to boost a DC voltage (storage battery voltage) V1 input from the storage battery 70 of the second storage battery block 7. The boost converter (boost chopper circuit) 10 has a switching element Q1, a choke coil L1, a diode D1, a resistor R1 and the like. The first end of the choke coil L1 is electrically connected to the positive electrode of the storage battery 70. The switching element Q1 is made of, for example, an enhancement type N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). The drain of the switching element Q1 is electrically connected to the second end of the choke coil L1 and the anode of the diode D1. The source of the switching element Q1 is electrically connected to the first end of the resistor R1. A second end of the resistor R1 is electrically connected to the negative electrode of the storage battery 70 and the output terminal 102 on the negative electrode side of the boost converter 10. The cathode of the diode D1 is electrically connected to the output terminal 101 on the positive electrode side of the boost converter 10.

  Converter control circuit 140 detects a voltage across converter 11 (converter output voltage V2), and PWM (pulse width modulation) of switching element Q1 so that converter output voltage V2 matches a predetermined target value. Control. A signal that converter control circuit 140 inputs to the gate of switching element Q1 to switch switching element Q1 is referred to as converter control signal S1.

  The first end of the first output capacitor 11 is electrically connected to the positive output terminal 101 of the boost converter 10, and the second end of the first output capacitor 11 is the negative output terminal 102 of the boost converter 10 It is electrically connected.

  The current suppression circuit 13 includes a transistor 130, a delay circuit 131, and a level shift circuit 132. The transistor 130 is, for example, an enhancement type P-channel MOSFET. The source of the transistor 130 is electrically connected to the output terminal 101 on the positive side of the boost converter 10. The drain of the transistor 130 is electrically connected to the positive electrode of the second output capacitor 12. The transistor 130 is turned off when the gate-source voltage is less than the threshold voltage. In addition, when the voltage between the gate and the source rises to a voltage sufficiently higher than the threshold voltage (referred to as a complete on voltage), the transistor 130 is completely turned on. Furthermore, in the range where the voltage between the gate and the source is higher than the threshold voltage and lower than the complete on voltage, the transistor 130 is in a transition state in which the off state transitions to the on state. Note that the on-resistance of the transistor 130 in the transient state decreases as the voltage between the gate and the source rises. That is, when the transistor 130 is in the ON state, the current suppression circuit 13 brings the electric path for feeding from the output terminal 101 of the boost converter 10 to the load (drive circuit 20) conductive. In addition, the current suppression circuit 13 is in a blocking state in which the power path for feeding is shut off when the transistor 130 is in the off state. Furthermore, the current suppression circuit 13 is in a transition state in which the blocking state transitions to the conduction state when the transistor 130 is in the transition state.

  When the drive signal S2 is not input from the control circuit 141, the level shift circuit 132 raises (level shifts) the gate potential of the transistor 130 to make the gate-source voltage less than the threshold voltage. On the other hand, when the drive signal S2 is input from the control circuit 141, the level shift circuit 132 lowers the gate potential of the transistor 130 to raise the gate-source voltage to the full on voltage. The drive signal S2 output from the control circuit 141 is a square wave voltage signal.

  The delay circuit 131 has, for example, a CR circuit (an integrating circuit). The delay circuit 131 delays the time from the rise of the drive signal S2 output from the control circuit 141 to the gate-source voltage of the transistor 130 reaching the full on voltage. That is, the current suppression circuit 13 is in the transition state during the delay time of the gate-source voltage rise by the delay circuit 131, and is in the conduction state after the delay time has elapsed.

  The negative electrode of the second output capacitor 12 is electrically connected to the output terminal 102 on the negative electrode side of the boost converter 10. Further, a load capacitor C 0 is electrically connected in parallel to the second output capacitor 12. Then, the voltage across the load capacitor C0 is applied to the load (drive circuit 20) as the output voltage V3 of the power supply device 1. Preferably, each of the second output capacitor 12 and the load capacitor C0 is formed of an electrolytic capacitor. However, the second output capacitor 12 and the load capacitor C0 may be shared by one electrolytic capacitor.

  The control circuit 141 outputs a drive signal S2 composed of a square wave voltage signal to the current suppression circuit 13. The control circuit 141 has a microcontroller. The control circuit 141 controls the converter control circuit 140 and the acoustic output circuit 142, respectively. However, converter control circuit 140, control circuit 141, and sound output circuit 142 may each be configured of a single semiconductor integrated circuit. Alternatively, at least one of the converter control circuit 140 and the acoustic output circuit 142 may be realized by a microcontroller (hardware) included in the control circuit 141 and software.

  Hereinafter, operations of the power supply device 1 and the acoustic device 2 will be described with reference to FIGS. 3 and 4. However, FIG. 4 shows the storage battery voltage V1, the converter output voltage V2, the output voltage V3 of the power supply device 1, the induction sound instruction signal S4 input to the acoustic device 2 from the induction lamp signal device, the drive signal S2, The waveforms of the converter control signal S1 and the acoustic signal S3 are shown. The guidance light signal device changes the guidance sound instruction signal S4 from the high level to the low level when instructing the sound device 2 to output a guidance sound. In the following description, the falling of the guidance sound instruction signal S4 from the high level to the low level may be reworded as "the guidance sound instruction signal S4 is input."

  Control circuit 141 does not output drive signal S2 in a period (time t <t2) in which induction sound instruction signal S4 is not input, and outputs a converter control signal to converter control circuit 140 and sound output circuit 142. The output of S1 and the sound signal S3 is stopped. That is, boost converter 10 is stopped by converter control circuit 140 not outputting converter control signal S1. Further, the control circuit 141 does not output the drive signal S2, so that the current suppression circuit 13 is maintained in the cutoff state. Here, even when the boost converter 10 is stopped, the positive electrode of the storage battery 70 and the output terminal 101 on the positive electrode side are electrically connected via the choke coil L1 and the diode D1. Therefore, if the electric path (circuit) from output terminals 101 and 102 of boost converter 10 to drive circuit 20 is closed while boost converter 10 is stopped, storage battery 70 is discharged to drive circuit 20 and the capacity of storage battery 70 decreases. There is a risk of On the other hand, in the power supply device 1 of the present embodiment, the electric path from the storage battery 70 to the drive circuit 20 is cut off by the current suppression circuit 13 during the period when the induction sound instruction signal S4 is not input. 70 capacity reduction can be prevented.

  The control circuit 141 raises the drive signal S2 to a high level (outputs the drive signal S2) when the guidance sound instruction signal S4 is input from the outside (the induction sound signal device) (time t = t2). However, at this time, the control circuit 141 does not output the converter control signal S1 and the acoustic signal S3 from the converter control circuit 140 and the acoustic output circuit 142.

  When the drive signal S2 rises from the low level to the high level, the level shift circuit 132 of the current suppression circuit 13 operates to lower the gate potential of the transistor 130 and raise the gate-source voltage to the full on voltage. However, the delay circuit 131 delays the fall of the gate potential of the transistor 130 by the level shift circuit 132. Therefore, during the delay time (time t = t2 to t3) in which the delay circuit 131 delays the rise of the gate-source voltage, the transistor 130 becomes a transient state to gradually reduce the on-resistance. As a result, the output voltage V3 of the power supply device 1 gradually rises from 0 V to a voltage substantially equal to the storage battery voltage V1 of the storage battery 70. That is, in the current suppression circuit 13, since the delay circuit 131 delays the rise of the gate-source voltage, the second output capacitor 12 and the load capacitor C0 are compared with the case where the rise of the gate-source voltage is not delayed. It is possible to suppress the inrush current flowing to the

  The control circuit 141 causes the converter control circuit 140 to output the converter control signal S1 after the transition of the transistor 130 from the transient state to the full on state (time t = t4). Boost converter 10 starts its operation by outputting converter control signal S1 from converter control circuit 140, and boosts storage battery voltage V1. Then, the converter output voltage V2 boosted to a voltage higher than the storage battery voltage V1 is applied to both ends of the load capacitor C0 via the current suppression circuit 13 and the second output capacitor 12.

  After causing the converter control circuit 140 to start the operation of the boost converter 10, the control circuit 141 causes the acoustic output circuit 142 to output the acoustic signal S3 to the drive circuit 20 (time t = t5). The drive circuit 20 amplifies the acoustic signal S3 by the output voltage V3 of the power supply device 1, and drives the speaker 21 by the amplified acoustic signal S3. As a result, the guidance sound is output from the speaker 21 of the sound device 2. Even when the second inspection switch is turned on, the guidance sound instruction signal S4 is input to the control circuit 141, and the guidance sound is output from the speaker 21 of the acoustic device 2.

  By the way, in the emergency device 3, when the storage battery 70 reaches the end of its life, replacement work of the second storage battery block 7 is performed. In the replacement operation, after the old storage battery 70 is electrically disconnected from the power supply 1 and each of the first output capacitor 11, the second output capacitor 12 and the load capacitor C0 is sufficiently discharged, a new storage battery is obtained. 70 is considered to be electrically connected to power supply 1. Then, when the new storage battery 70 is fully charged or nearly charged, rush current flows into the power supply 1 at the moment when the new storage battery 70 is electrically connected to the power supply 1. The magnitude of the inrush current increases as the capacity of the capacitor forming a closed circuit with the new storage battery 70 increases.

  In the power supply device 1, normally, since the guidance sound instruction signal S4 is not input during the replacement work of the second storage battery block 7, the current suppression circuit 13 is in the cutoff state. Therefore, in the power supply device 1, only the first output capacitor 11 is a capacitor that forms a closed circuit with the new storage battery 70. On the other hand, when the power supply device 1 supplies power to the drive circuit 20, the first output capacitor 11, the second output capacitor 12, and the load capacitor C0 are connected between the pair of output terminals 101 and 102 of the boost converter 10. Three capacitors are electrically connected in parallel. That is, when the power supply device 1 supplies power to the drive circuit 20, the capacitances of the capacitors connected to the pair of output terminals 101 and 102 of the boost converter 10 are the combined capacitance of the respective capacitances of the three capacitors 11, 12 and C0. Become. Since the combined capacitance in the parallel circuit of the first output capacitor 11, the second output capacitor 12 and the load capacitor C0 is the sum of the capacitances of the respective capacitors 11, 12, and C0, the capacitance of the first output capacitor 11 is It's bigger than it is.

  Therefore, as shown in FIG. 4, when the new storage battery 70 is electrically connected to the power supply device 1 and the storage battery voltage V1 input to the boost converter 10 rises (time t = t1), the storage battery voltage V1 as described above Causes the first output capacitor 11 to be charged. Then, a current (rush current) flows from the storage battery 70 into the first output capacitor 11 until the voltage across the first output capacitor 11 (converter output voltage V2) becomes equal to the storage battery voltage V1. However, the magnitude of the current flowing from the storage battery 70 into the first output capacitor 11 is determined by the capacity of the first output capacitor 11, so it is significantly greater than when current flows into the three capacitors 11, 12 and C0. Decrease. The capacity of the first output capacitor 11 is smaller than the combined capacity of the second output capacitor 12 and the load capacitor C0, which is suitable for suppressing the current. However, even when the capacitance of the first output capacitor 11 is equal to or larger than the combined capacitance of the second output capacitor 12 and the load capacitor C0, it is possible to suppress the current. Also, the load capacitor C0 may be shared with the second output capacitor 12.

  As described above, in the power supply device 1 of the present embodiment, the capacitance for smoothing the output voltage of the boost converter 10 is a capacitance of the first output capacitor 11 disposed in the front stage (input side) of the current suppression circuit 13. , And the capacitance of the second output capacitor 12 disposed at the rear stage (output side) of the current suppression circuit 13. Furthermore, the current suppression circuit 13 cuts off the feed path (electrical path) from the boost converter 10 to the load (drive circuit 20) when the induction sound instruction signal S4 is not input to the control circuit 141 of the power supply device 1. . Therefore, the power supply device 1 can suppress the current (rush current) even when the second storage battery block 7 is replaced. However, the opportunity for the storage battery 70 to be attached to and detached from the power supply device 1 is not limited to the replacement work of the second storage battery block 7, and includes, for example, the installation work of the emergency device 3.

  Moreover, in the power supply device 1 of the present embodiment, the current suppression circuit and the shutoff circuit are integrated into one current suppression circuit 13 and arranged in the subsequent stage (output side) of the boost converter 10. Therefore, as compared with the case where the plurality of types of circuits (the current suppression circuit and the cutoff circuit) each are configured using semiconductor elements, the power supply device 1 improves the reliability while reducing the circuit scale, for example, Deterioration of the circuit element due to the rush current can be suppressed.

  In addition, the emergency device 3 of this embodiment is not limited to a guide lamp. For example, the emergency device may be configured not to include at least one of the display unit 4 and the blinking light source unit 5.

  As described above, the power supply device (1) according to the first aspect of the present invention includes the boost converter (10) for boosting the input voltage (storage battery voltage V1) input from the emergency power supply (storage battery 70). The power supply (1) comprises a first output capacitor (11) electrically connected in parallel with a pair of output terminals (101, 102) of the boost converter (10). The power supply device (1) includes a current suppression circuit (1) electrically connected in series with one output terminal (101) of the pair of output terminals (101, 102) across the first output capacitor (11). 13). The power supply device (1) is electrically connected in parallel with the first output capacitor (11) across the current suppression circuit (13), and is electrically connected with the load (drive circuit 20). An output capacitor (12) and a control circuit (141) are provided. The control circuit (141) alternatively switches the operation state of the current suppression circuit (13) to the cutoff state, the conduction state, or the transition state. The control circuit (141) keeps the operation state of the current suppression circuit (13) in the cutoff state until the trigger signal (induction sound instruction signal S4) is input, and when the trigger signal is input, the control circuit (13) The operating state is switched from the disconnection state to the conduction state through the transition state. The shutoff state is an operation state in which the electric path from one output terminal (101) of the boost converter (10) to the second output capacitor (12) is shut off. The conduction state is an operation state in which the electric path is brought into conduction. The transition state is an operation state in which a transition is made from the disconnection state to the conduction state by applying a predetermined transition time.

  A power supply device (1) according to a first aspect divides a capacitor for smoothing an output voltage of a boost converter (10) into a first output capacitor (11) and a second output capacitor (12). It distributes to the front | former stage of a current suppression circuit (13), and a back | latter stage, and is arrange | positioned. Therefore, the power supply device (1) according to the first aspect can suppress the inrush current that flows when the input voltage of the boost converter (10) rises sharply. Further, in the power supply device (1) according to the first aspect, the control circuit (141) shuts off the operation state of the current suppression circuit (13) until the trigger signal is input, and wastes power consumption. It can be suppressed. Moreover, in the power supply apparatus (1) according to the first aspect, when the trigger signal is input, the control circuit (141) switches the operating state of the current suppression circuit (13) from the blocking state to the conducting state through the transition state. Therefore, it is possible to suppress inrush current when power supply to the load is started. As a result, the power supply device (1) according to the first aspect can improve the reliability while reducing the circuit scale.

  The power supply device (1) according to the second aspect of the present invention can be realized by the combination with the first aspect. In the power supply device (1) according to the second aspect, the capacitance of the first output capacitor (11) is preferably smaller than the capacitance of the second output capacitor (12).

  The power supply device (1) according to the second aspect further suppresses the rush current as compared to the case where the capacity of the first output capacitor (11) is larger than the capacity of the second output capacitor (12). be able to.

  The power supply device (1) according to the third aspect of the present invention can be realized by the combination with the first or second aspect. In the power supply device (1) according to the third aspect, the current suppression circuit (13) preferably includes a transistor (130) inserted in the electric path. The current suppression circuit (13) preferably includes a delay circuit (131) that delays a drive signal input from the control circuit (141) to the control terminal (gate) of the transistor (130).

  The power supply device (1) according to the third aspect can further suppress the inrush current flowing into the second output capacitor (12) when power feeding to the load is started.

  The power supply device (1) according to the fourth aspect of the present invention can be realized by a combination with the third aspect. In the power supply (1) according to the fourth aspect, the transistor (130) is preferably a field effect transistor. The delay circuit (131) preferably delays the change in voltage of the drive signal applied between the gate and source of the transistor (130).

  The power supply device (1) according to the fourth aspect can further suppress the inrush current flowing into the second output capacitor (12) when power feeding to the load is started.

  The power supply device (1) according to the fifth aspect of the present invention can be realized by a combination with the third or fourth aspect. In the power supply device (1) according to the fifth aspect, the delay circuit (131) preferably has a CR integration circuit.

  The power supply device (1) according to the fifth aspect can simplify the circuit configuration of the delay circuit (131).

  The sound device (2) according to the sixth aspect of the present invention is supplied from the power supply device (1) according to any one of the first to fifth aspects, the speaker (21), and the power supply device (1). And a drive circuit (20) for driving the speaker (21) with electric power.

  The sound device (2) according to the sixth aspect can improve the reliability while reducing the circuit scale.

  The emergency device (3) according to the seventh aspect of the present invention includes the acoustic device (2) according to the sixth aspect, and a case (30) accommodating the acoustic device (2). The sound device (2) causes the speaker (21) to output a sound for evacuation guidance when it receives a trigger signal (the guidance sound instruction signal S4) from the outside.

  The emergency device (3) according to the seventh aspect can improve the reliability while reducing the circuit scale.

DESCRIPTION OF SYMBOLS 1 power supply device 2 acoustic device 3 emergency device 10 boost converter 11 1st output capacitor 12 2nd output capacitor 13 current suppression circuit 20 drive circuit 21 speaker 30 case 70 storage battery (emergency power supply)
101 output terminal 102 output terminal 130 transistor 131 delay circuit 141 control circuit V1 storage battery voltage (input voltage)
S4 Guidance sound indication signal (trigger signal)

Claims (7)

A boost converter that boosts the input voltage input from the emergency power supply,
A first output capacitor electrically connected in parallel with a pair of output terminals of the boost converter;
A current suppression circuit electrically connected in series with one of the pair of output terminals across the first output capacitor;
A second output capacitor electrically connected in parallel to the first output capacitor across the current suppression circuit and electrically connected to a load;
The operating state of the current suppression circuit is a cut-off state in which the electric path from the one output terminal of the boost converter to the second output capacitor is cut off, a conductive state in which the electric path is conductive, and the cut-off state to the conductive state And a control circuit for selectively switching to a transition state in which transition is made by multiplying a predetermined transition time,
The control circuit keeps the operation state of the current suppression circuit in the cut-off state until the trigger signal is input, and when the trigger signal is input, the operation state of the current suppression circuit passes from the cut-off state through the transition state. Switch to the conductive state,
Power supply. The capacitance of the first output capacitor is smaller than the capacitance of the second output capacitor,
The power supply device according to claim 1. The current suppression circuit
A transistor inserted into the electrical path;
And a delay circuit for delaying a drive signal input from the control circuit to the control terminal of the transistor.
The power supply device according to claim 1. The transistor is a field effect transistor,
The delay circuit delays a change in voltage of a drive signal applied between the gate and the source of the transistor.
The power supply device according to claim 3. The delay circuit has a CR integration circuit,
The power supply device according to claim 3 or 4. The power supply device according to any one of claims 1 to 5,
A speaker,
And a drive circuit for driving the speaker by the power supplied from the power supply device.
Sound equipment. An acoustic device according to claim 6;
And a case for housing the sound device;
The acoustic device causes the speaker to output a sound for evacuation guidance when it receives a trigger signal from the outside.
Emergency equipment.

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